<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
{% set telephone = '13888888999' %}
{% set nav = [('index.html','index'),('product.html','product')] %}
{% telephone %}
{{ nav }}
{% with pass = 60 %}
{% endwith %}
</body>
</html>